[keziahamber]

There are two fish really chasing after this one fish quite aggressively. They are zebra danios. What is going on? Could they be trying to mate?

 

[dirtydutch4x]

good chance thats it just watch them in the morning with first light and they will go to the bottom and thats when they release their eggs and fertilize them. the eggs drop to thebottom in the substrate and unless the eggs can fall into the rocks they will most likely eat the eggs soon after dropping. Im sure someone here has better knowledge on them but that is what I learned about mine.

 

[dctidd]

I am a newby to aquariums but I had a zebra fish and it chased every fish. I ended up taking it back to the pet shop. They told me that is common with that type of fish - just more aggressive than others.

 

[TheFishLegend]

Ive had some zebras in the past and you always get a couple that are just crazy, try taking them out of the tank and then move some plants around and then put them back in, this should re establish the pecking order within the tank.